194445389 has 2 divisors, whose sum is σ = 194445390. Its totient is φ = 194445388.

The previous prime is 194445359. The next prime is 194445401. The reversal of 194445389 is 983544491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177289225 + 17156164 = 13315^2 + 4142^2 .

It is an emirp because it is prime and its reverse (983544491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194445389 - 2²⁰ = 193396813 is a prime.

It is a super-2 number, since 2×194445389² = 75618018606722642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194445359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97222694 + 97222695.

It is an arithmetic number, because the mean of its divisors is an integer number (97222695).

Almost surely, 2^194445389 is an apocalyptic number.

It is an amenable number.

194445389 is a deficient number, since it is larger than the sum of its proper divisors (1).

194445389 is an equidigital number, since it uses as much as digits as its factorization.

194445389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 47.

The square root of 194445389 is about 13944.3676443215. The cubic root of 194445389 is about 579.3387122320.

The spelling of 194445389 in words is "one hundred ninety-four million, four hundred forty-five thousand, three hundred eighty-nine".